[Elecraft] Digital SSB..?

[Brian Lloyd]

On May 16, 2007, at 7:41 PM, Sandy wrote:

> Keep in mind that the spurs generated will probably [produce a  
> signal that will exceed the 2.7 Khz bandwidth!  Especially with  
> operators who are not that technically inclined.  To digitize the  
> signal really won't gain you a whole lot!  As more and more people  
> try it, I fear the noise floor will rise with more and more use of it.

You see that all the time on PSK31. The sad thing is that it is so  
easy to get it right. Usually the problem is nothing more than  
turning the mic gain up too high and causing splatter. OTOH, if you  
are doing that you are running your PA and your amplifier (if you  
have one) at 100% power output with 100% duty cycle. That will tend  
to be a self-correcting problem as hams destroy their amplifiers and  
the PAs in their rigs.

FWIW:

1. turn off DSP signal processing on receive (no noise reduction);
2. turn off your transmitter speech processing;
3. turn the mic gain down until you are only getting about 30W out  
(as most 100W rigs are rated at only 40W continuous).

Do those three things and you will have good success with the digital  
modes such as they are today, i.e. sound card in your computer  
plugged into your K2.

73 de Brian, WB6RQN
Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com